98 J. W. Powell— Organization and Plan 
tions can be used over and over again for such purposes when 
needed, as reproduction can be made at the small cost of 
electrotyping. These same illustrations can be used by the 
public at large in scientific periodicals, text-books, etc. All 
the illustrations made by the Geological Survey are held for 
the public to be used in this manner. 
LIBRARY. 
The library of the Survey now contains more than 25,000 
volumes, and is rapidly growing by means of exchanges. It 
is found necessary to purchase but few books. The librarian, 
Mr. C. C. Darwin, has a corps of assistants engaged in biblio- 
graphic work. It is proposed to prepare a catalogue of Amerl- 
can and foreign publications upon American geology, which is’ 
to be a general authors’ catalogue. In addition to this, it is 
proposed to publish bibliographies proper of special subjects 
constituting integral parts of the science of geology. 
PUBLICATIONS. 
The publications of the Survey are in three series: Annual 
Reports, Bulletins and Monographs. The Annual Report con- 
stitutes a part of the Report of the Secretary of the Interior for 
each year, but is.a distinct volume. This contains a brie 
summary of the purposes, plans and operations of the Survey, 
prepared by the Director, and short administrative reports from 
the chiefs of divisions, the whole followed by scientitic papers. 
These papers are selected as being those of most general interest, 
the object being to make the Annual Report a somewhat popular 
account of the doings of the Survey, that it may be widely read 
by the intelligent people of the country.. Of this 5650 copies 
are published as a part of the Secretary’s report, and are dis- 
tributed by the Secretary of the Interior, Senators and Members 
of the House of Representatives; and an extra edition is annu- 
ally ordered of 15,000 copies, distributed by the Survey and 
members of the Senate and House of Representatives. Four 
Annual Reports have been published; the Fifth is now in the 
hands of the printer. 
The Bulletins of the Survey are short papers; and through 
them somewhat speedy publication is attained. Each Bulletin 
is devoted to some’specific topic, in order that the material ulti- 
timately published in the Bulletins can be classified in any 
manner desired by scientific men. Nine Bulletins have been 
published, and seven are in press. The Bulletins already pub- 
lished vary in size from 5 to 325 pages each; they are sold at 
the cost of press-work and paper, and vary in price from five 
to twenty cents each. 4900 copies of each Bulletin are pub- © | 
